Your lawn’s health relies on many factors. Of course feeding, weeding and watering contribute to healthy grass, but you may not know that mower height belongs on that list as well, affecting much more than basic aesthetics.
Effects of Proper Lawn Height
Cutting grass at the proper height encourages new growth, which leads to a denser lawn. And density comes with many benefits. A dense, healthy lawn withstands pests better and discourages weeds, requiring less chemical intervention. A denser lawn also withstands drought and wear better, helping protect the soil and prevent erosion.
Effects of Improper Lawn Height
Cutting your lawn too short can cause damage. Grass needs enough blade height to turn sunlight into energy through photosynthesis.
When the blades are cut too short, the grass can’t convert enough sunlight to sustain a vigorous root system. A weak root system absorbs fewer nutrients and less water, ultimately restricting growth and inviting pests, weeds, erosion and other issues.
Recommended Mowing Heights by Grass Type
To determine the best mowing height for your lawn, first identify the type of grass growing in your yard. Each grass variety has its own ideal height range:
- Warm-season grasses like Bermuda and Zoysia do best at a mowing height of 1.5 inches year-round.
- Optionally, you may lower to 1 inch as the grass enters or exits dormancy, but 1.5 inches remains the standard for consistent results.
- Cool-season grasses like Rebel Supreme Fescue and bluegrass blends prefer a taller cut, averaging around 2.5 inches.
- You can mow as low as 2 inches in winter, but raising the mowing height to 3–4 inches in summer is especially important. The taller blades provide extra insulation and help cool-season grasses better withstand the intense heat and drought stress of Southern summers.
When to Raise Your Mower Height
While consistency is key, there are a few times when slightly raising your mower deck is beneficial:
When unrelenting Southern summers bring an onslaught of hot, dry weather, raise your mower deck half an inch higher to help relieve your lawn of stress.
Grass in shady areas struggles to get sunlight. Leaving blades a little longer allows for better photosynthesis and healthier growth.
To battle crabgrass, keep to the higher side of the optimal height range. Longer grass shades the soil and helps discourage germination of seeds from crabgrass and other pesky weeds.
Obey the 1/3 Rule
One mowing rule is universal, no matter your grass type — never cut more than one third of the grass height at once. Cutting too much at once shocks the grass and disrupts the balance between the blades and roots.
If your lawn has grown too tall, resist the urge to cut it all at once. Instead, return to your regular schedule and remove just one third at each mowing until the lawn returns to its optimal height.
Frequently Asked Questions About Mowing Heights
Q: What is the best mowing height for Bermuda grass?
The ideal mowing height for Bermuda grass is 1.5 inches year-round. For a cleaner look during dormancy transitions, you may optionally lower it to 1 inch, but 1.5 inches remains the recommended height for consistent care.
Q: How short should I mow Zoysia grass?
Zoysia varieties, including Zeon and El Toro, perform best when mowed at 1.5 inches year-round. Lowering the height slightly during dormancy is optional, but consistency at 1.5 inches is best for most homeowners.
Q: What height should I mow Fescue in summer?
Fescue should be mowed at 2.5 inches on average, but during the summer heat, it’s especially important to raise the mowing height to 3–4 inches to help reduce stress and retain soil moisture.
Q: Can I mow my lawn less often in the fall?
Yes, as grass growth slows in the fall, mowing frequency can be reduced — but continue mowing as long as the grass is actively growing. Avoid letting it grow too tall, which can encourage disease and pests.
Q: Is it okay to cut my grass very short before winter?
No — avoid scalping your lawn before winter. For warm-season grasses, stick to 1.5 inches; for cool-season grasses, stay around 2–2.5 inches going into winter. Cutting too short weakens the grass and exposes it to stress and disease.
Questions?
If you need assistance selecting the perfect grass variety for your shady or problem area, don’t hesitate to reach out to the Turfgrass Professionals at NG Turf at 770.832.8608 or info@NGTurf.com, who are ready to provide expert guidance and help you create a beautiful, thriving lawn tailored to your specific needs.
